A cumulonimbus cloud was spotted from Galveston, Texas, on Wednesday, July 11, 2018.(Instagram/thebotanicaljourney)

In this case, the cumulonimbus cloud was associated with a thunderstorm that was dumping heavy rain over parts of the Houston metro area, some 45 miles to the northwest.

Radar imagery from the evening of July 11, 2018, shows an isolated thunderstorm dumping heavy rainfall on parts of the Houston metro area.

It was the very definition of what meteorologists refer to as "isolated thunderstorms." As you can see on the radar image above, there were no other thunderstorms around the Houston and Galveston areas at the time.

In fact, skies were mostly clear outside of this one thunderstorm in southeastern Texas.

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